To clarify the movement of water flooding front in fluvial reservoirs, this research takes BZ oilfield as an example. By comprehensively considering the [w1] equivalent flowing resistance theory of oil-water two phases, the horizontal micro-element equivalent method, and the strong heterogeneity of fluvial facies reservoir, the calculation model of non-piston water flooding front in horizontal well pattern is established. Firstly, five horizontal injection-production well groups in BZ oilfield are taken as examples to calculate the water breakthrough time of oil wells respectively. The calculation results are in good agreement with the actual production performance. In detail, the front advancing speed of the high permeability strip is 0.8 ∼ 1.6m/d, and the speed in low permeability strip is 0.12 ∼ 0.35m/d. When the oil well sees water, the advance speed of the low permeability strip becomes slower, resulting in uneven displacement and easily forming non-dominant potential areas. Moreover, the water flooding front advancing distance is simulated to be 300 ∼ 450m by establishing the reservoir numerical simulation model, which is close to the result of the proposed model, indicating that the calculation method is reliable. The research is of great significance for predicting the water breakthrough time of horizontal production wells, judging the weak affected area on the mainstream line, and timely optimizing water injection and tapping reservoir potential.

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